What you'll see: One of the best ideas in the Bay Area is Sunday's weekly closure of 4 miles of Cañada Road on the Peninsula near the Crystal Springs Watershed. "Bicycle Sundays" work for all ages, whether walking, jogging or taking off on short or long bike trips.

Cañada Road: The road is closed from 9 a.m. to 3 p.m. to cars from the northern staging area near Highway 92 to the southern staging area at the turnoff for Filoli. Wear a rear-view mirror on your helmet so you don't have to turn your head to see behind you (and potentially veer into other bikes).

Extending north: The Sawyer Camp section of the Crystal Springs Trail extends north of Highway 92 along Crystal Springs Reservoir for 5 miles to the dam at San Andreas Lake. At the 1.7-mile point, a detour is required (through 2014) around a work project at Crystal Springs Dam at San Mateo Creek. Occasional hydroseeding on weekdays through mid-November will cause temporary closures; updates at (866) 973-1476.

Now/future: Crystal Springs Trail spans 15.3 miles; when complete, it will extend 17.5 miles from San Bruno to Woodside.

Pulgas Ridge: This 366-acre preserve has six miles of trails, adjoins San Francisco watershed lands and has an off-leash area for dogs. This is one of the few dog-friendly preserves on the Peninsula.

How to get to northern staging area: From San Francisco, take Interstate 280 south and drive about 20 miles to Exit 34 for Highway 35 (also signed for Highway 92/Half Moon Bay). Take that exit to Highway 35, turn left and drive 1.1 miles to Highway 92. Turn left and drive 0.6 mile to Cañada Road on right. Turn right and go short distance to closed road, parking and northern access point.

How to get to southern staging area: From south Peninsula, take I-280 north past Woodside to Exit 29 for Edgewood Road. Take that exit, turn left on Edgewood and drive 0.5 mile to Cañada Road. Turn right and drive short distance to closed road, parking and southern access point.

Extend to Pulgas Preserve: From southern staging area, ride bike (or drive) short distance to Edgewood Road. Turn left and ride 1.3 miles to Crestview Drive. Turn left, continue short distance to Edmonds (signed for park), turn left again and go short distance to preserve entrance on right.